An insult kamikaze is the term applied to the action of insulting someone at your expense, so you insult both yourself and the other person.
Miguel: Suck dick Nico.
Lane: Nico does know how to suck some dick.
Nico: You would know.
Lane: Are you insulting me or yourself?
Nico: I don't know, both of us I guess.
Lane: So it's like an insult kamikaze.
Nico: I like that, I have to add that to the Urban Dictionary